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Joint Optimization of Video and Audio Quality For Real-Time Video Conferencing

Tsinghua National Laboratory for Information Science and Technology
Intellectual Venture Chair Professor Group
Distinguished Lecture Series
Joint Optimization of Video and Audio Quality
For Real-Time Video Conferencing
Benjamin Wan-Sang Wah, Chinese University of Hong Kong
Time: 10:00-12:00, Nov. 21
Place: FIT Building 1-315

Abstract
In real-time interactive multimedia systems over the Internet, like tele-immersive, video conferencing, and voice-over-IP systems, the experience perceived by users is usually more important than objective metrics measured on signals and packets. Packet delays, loss, jitters, signal quality, and distortion are some of the multi-dimensional metrics that affect perceived quality. However, their relationship to the network design and control that leads to high l user quality is complex and unknown. Although many multimedia standards have been developed, they invariably focus on one-way perceived quality and not on the quality of interaction. In this presentation, we examine various efforts in this direction and a methodology to design such a system. The challenge is to design a large-scale adaptive multi-party interactive system with high perceptual quality. One-way audiovisual quality and mouth-to-ear delay (MED) are two important quality metrics in the design of real-time video-conferencing systems, and their trade-offs have significant impact on the user-perceived quality. In this presentation, we address one aspect of this larger problem by developing efficient loss-concealment schemes that optimize the one-way quality under given MED and network conditions. Our experimental results show that our approach can attain significant improvements over the LARDo reference scheme that does not consider MED in its optimization.

Biography
Benjamin W. Wah is currently the Provost of the Chinese University of Hong Kong. Before then, he served as the Director of the Advanced Digital Sciences Center in Singapore, as well as the Franklin W. Woeltge Endowed Professor of Electrical and Computer Engineering and Professor of the Coordinated Science Laboratory of the University of Illinois at Urbana-Champaign, Urbana, IL. He received his Ph.D. degree in computer science from the University of California, Berkeley, CA, in 1979. He had served on the faculty of Purdue University. He has received a number of awards for his research contributions, which include the IEEE CS Technical Achievement Award (1998), the IEEE Millennium Medal (2000), the Society for Design and Process Science Raymond T. Yeh Lifetime Achievement Award (2003), the IEEE-CS W. Wallace-McDowell Award (2006), the Pan Wen-Yuan Outstanding Research Award (2006), the IEEE-CS Richard E. Merwin Award (2007), the IEEE-CS Technical Committee on Distributed Processing Outstanding Achievement Award (2007), and the IEEE-CS Tsutomu Kanai Award (2009). Wah's current research interests are in the areas of nonlinear search and optimization, multimedia signal processing, and computer networks.
Wah cofounded the IEEE Transactions on Knowledge and Data Engineering in 1988 and served as its Editor-in-Chief between 1993 and 1996, and is the Honorary Editor-in-Chief of Knowledge and Information Systems. He currently serves on the editorial boards of Information Sciences, International Journal on Artificial Intelligence Tools, Journal of VLSI Signal Processing, and World Wide Web. He had chaired a number of international conferences, including the 2000 IFIP World Congress and the 2008 IEEE International Conferences on Distributed Computing Systems. He has served the IEEE Computer Society in various capacities, including Vice President for Publications (1998 and 1999) and President (2001). He is a Fellow of the AAAS, ACM, and IEEE.

 

 

【发布时间:2011-12-08】【浏览次数: